| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| BARLOW, PUGH & ASSOCIATES LIMITED | 01384228 | 03/08/2010 | Dissolved |
| Freeson Holdings Ltd | 01669447 | 18/12/1991 | Dissolved |
| Freeson Holdings Ltd | 01669447 | 18/12/1991 | Dissolved |
| GENERAL DAMP COURSE & WOODWORM COMPANY LIMITED | 01190843 | 03/08/2010 | Dissolved |
| KENILAP LIMITED | 01061742 | 18/12/1991 | Dissolved |
| Kapelin Ltd | 01674061 | 18/12/1991 | Dissolved |
| LENIKAP LIMITED | 01757815 | 20/11/1991 | Insolvent |
| Linkape Ltd | 01587501 | 22/03/1991 | Dissolved |
| MARTECCA LIMITED | 07617448 | 28/04/2011 | Dissolved |
| Newseal Group Ltd | 02595489 | 26/03/1991 | Dissolved |
| PHOENIX PRESERVATION LIMITED | 00542895 | 03/08/2010 | Strike Off |
| PROTEN SERVICES LIMITED | 04238474 | 18/12/2006 | Dissolved |
| PROTIM SERVICES LIMITED | 00713374 | 03/05/2010 | Dissolved |
| RADON GAS SYSTEMS LIMITED | 07908562 | 13/01/2012 | Dissolved |
| THERMABILITY LIMITED | 07647260 | 25/05/2011 | Dissolved |
| Westco & Inter City Preservation & Insulation Services & Wes | 01931682 | 22/03/1991 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| AQUIS DOUBLE DEFENCE LIMITED | 06740610 | 04/11/2008 | 30/06/2011 | Dissolved |
| BRITISH WALL TIE AND STRUCTURAL REPAIR ASSOCIATION | 02696252 | 11/03/1992 | 30/03/1993 | Dissolved |
| Cyberkap Ltd | 02978910 | 23/08/1995 | 31/05/1996 | Dissolved |
| FLOOD PROTECTION ASSOCIATION | 04373765 | 01/10/2010 | 06/07/2011 | Dissolved |
| Helibar Systems Ltd | 02698581 | 19/03/1992 | 01/04/1993 | Dissolved |
| THE RADON COUNCIL LIMITED | 02625210 | 05/07/2007 | 02/07/2009 | Silver |
| UK RADON ASSOCIATION | 08735211 | 16/10/2013 | 19/04/2018 | Gold |
| WETAWAY LIMITED | 06740603 | 04/11/2008 | 30/06/2011 | Dissolved |